Tautirut is an Inuit word that means "ice that forms over still waters." When it gets really cold outside, water can freeze and turn into ice. But sometimes, when the wind is blowing or there are waves in the water, the ice can't form very easily. That's where tautirut comes in. Tautirut is the ice that does form when there's no wind and the water is very still. It's really smooth and looks like glass. People in the Arctic use tautirut for lots of things, like building igloos or making tools out of the ice. Think of tautirut like a blanket that covers a glass of water and turns it into a solid piece of ice.